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Docker microservices refers to the use of a set of small services to develop a single application; each service runs in an independent process and is generally interconnected using a lightweight communication mechanism, and they can be automated through Deployment method; the idea of microservices is to split the traditional monolithic system into multiple interface services with single responsibilities and independent operation according to business.
The operating environment of this tutorial: linux7.3 system, docker version 19.03, Dell G3 computer.
It is a new term that has only appeared in the past two or three years. Although it has not been very long, almost every software practitioner has an impact on it and has also influenced it through microservices. Services, many people are aware of the impact of microservices on the software industry.
Definition
Use a set of small services to develop a single application. Each service runs in an independent process and is generally interconnected using a lightweight communication mechanism. , and they can be deployed in an automated manner.
The idea of microservices is to split the traditional monolithic system into multiple interface services with single responsibilities and independent operation according to business. There is no coupling between each service
How micro is considered micro
1. Amount of code?
But our languages are different. When writing the same business in different languages, the amount of code may vary greatly.
Judging by people's judgment, there is also a gap in the amount of code written by developers in the internship period and those with more than 5 years of development experience.
2. Development time?
There are too many factors that affect development speed, including personal experience, languages that are good at development, and understanding of the business.
3. Immeasurable
is actually a design idea, a design idea, not a fixed quantity
Characteristics of microservices
1. Single responsibility
Orders and payments, login and registration, those that are not closely related to other businesses can be done separately Into a service mail, SMS service.
2. Lightweight communication
Lightweight communication protocol, simply speaking, is platform-independent and language-independent. http.
3. Isolation
Each microservice is in its own memory and will not interfere with each other.
4. Have your own data
Independence of business data. Each has its own business database to reduce business complexity
5. Technical diversity
Developers choose the most suitable development language and provide the necessary api.
Background of the birth of microservices
1. Rapid development of the Internet industry
Technology changes rapidly , the number of users changes rapidly
2. Agile development. The lean method is deeply rooted in the hearts of the people
Use the minimum cost to make the fastest iteration and get the most useful feedback. Frequent modifications and testing are launched.
3. Maturity of container technology
Before container technology matures, it is difficult for microservices to be implemented. The emergence of docker solves the hesitation in the number of microservices and operation and maintenance. bottleneck. Make the implementation of microservices possible.
Recommended learning: "docker video tutorial"
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